Mod your Beresford 7520

[StanleyB]

Looking great that. I might need to copy that picture and put it on my site when I add a 'mod' page.
All you need now is a couple of post £1K competitors to burn out.

STan

[Covenant]

Is this the board i need to use the THS4032.
http://cgi.ebay.co.uk/Surface-Mount-...3A1|240%3A1318

Some more questions
- Is it oke to change both standard opamps with the THS4032 or just one?

- I noticed that there are different types of the THS4032 that can be purchased. Do i need the THS4032CD or the THS4032ID? Seen on the site of Farnell.

- Has there any soldering to be done to mount the THS4032 on the board?

Have a look at Ebay item 260351823827-I think its the one required.

[chrism]

Can the THS4032 be used in the 7510 6/4 model? It looks to be a surface mount type but not certain of the leg spacings.

Also not certain about the difference with the THS4031? Is it something to do with single / dual amplifiers - not sure which the 7510 needs?

Regards

Chris

[HighFidelityGuy]

Those metal encased opamps do look awesome, nice work!

Sponge mentioned that a 0.1uF ceramic between pins 4 and 8 make an improvement. Is this something that will improve all of these opamps? Also, would any different value or types of caps work better? A 0.22uF poly cap for example? Please excuse my ignorance, I'm new to this electronics lark.

[StanleyB]

Can the THS4032 be used in the 7510 6/4 model? It looks to be a surface mount type but not certain of the leg spacings.

Yep. You'll need to solder a 100nF decoupling cap between pin 4 and pin 8 as well. The same goes for the LM4562MA.

[StanleyB]

Those metal encased opamps do look awesome, nice work!

Sponge mentioned that a 0.1uF ceramic between pins 4 and 8 make an improvement. Is this something that will improve all of these opamps?

Yep.

Also, would any different value or types of caps work better? A 0.22uF poly cap for example?

Nope

[rhmjmango]

Just a quick update following the THS4032 installation.
The paranoia factor got the better of me regarding decoupling caps. This was mentioned in the previous thread by Leo. So I decided to fit an additional 0.1uF ceramic across pins 4 and 8 of the opamp. It's not easy and I found the best way was to form the cap leads slightly and solder it directly to the chip pins lying the caps body on top of the chip.

However, the difference is well worth the effort - The sound is "cleaner", sharper and more dynamic.

If anyone is considering this opamp upgrade, I recommend fitting the decoupling caps from the start, believe me, you won't regret it.

For info, I got the THS4032's from Farnell at 4.63 GBP + VAT and the BrownDog adapers I already had from cimarrontechnology.com p/n 970601 at $2.39 + postage. Ceramic caps from pretty well anywhere - Dirt cheap.

Ken

Would it be possible to show a pic of this mod?

[drumlins4ever]

Been trying out the LM4562NA for the past few days and i really like em.

An improvement on the stock chips, very wide soundstage , great separation between instruments and very smooth, everything just seems right with them and i'd be happy to live with em long term.

Popped in a pair of OPA2132PA this morning to try out.

[HighFidelityGuy]

Yep.


Nope

Thanks.

Just out of interest, how come the 100nF cap wasn't included in the 7520's original design if it helps all the opamps?

[sponge]

Would it be possible to show a pic of this mod?

I'll try - I've never posted a picture yet. Leave that with me...

Just a quick question for Stan - Have you tried mixing Opamps? I have at the moment an OPA2132 in the left socket and a THS4032 in the right hand socket (as viewed from front) - Sounds good to me - Both chips are running cool but it's only been powered up for about 30mins. I'm not going to damage anything am I?

Thanks - Ken